Find the missing number. \( \begin{array}{ll}\text { 1. } \frac{1}{4}=\frac{\square}{8} & \text { 2. } \frac{9}{12}=\frac{\square}{4}\end{array} \)

Let's solve each proportion by finding the missing number (represented by the square). ### 1. \( \frac{1}{4} = \frac{\square}{8} \) **Solution:** To find the missing number, let's denote it as \( x \). \[ \frac{1}{4} = \frac{x}{8} \] **Cross-multiply:** \[ 1 \times 8 = 4 \times x \] \[ 8 = 4x \] **Solve for \( x \):** \[ x = \frac{8}{4} = 2 \] **Answer:** \( \boxed{2} \) --- ### 2. \( \frac{9}{12} = \frac{\square}{4} \) **Solution:** Let's denote the missing number as \( y \). First, simplify the fraction \( \frac{9}{12} \): \[ \frac{9}{12} = \frac{3}{4} \] So the equation becomes: \[ \frac{3}{4} = \frac{y}{4} \] **Cross-multiply:** \[ 3 \times 4 = 4 \times y \] \[ 12 = 4y \] **Solve for \( y \):** \[ y = \frac{12}{4} = 3 \] **Answer:** \( \boxed{3} \) --- **Final Answers:** 1. The missing number is **2**. 2. The missing number is **3**.